I’ve read the section in the Rust Book on importing crates but I am still missing something.

I have a project structure like:

hello_world
├── Cargo.lock
├── Cargo.toml
└── src
    ├── auth
    │   └── mssql.rs
    ├── auth.rs
    ├── pipeline.rs
    └── main.rs

my code looks like:

main.rs

pub mod pipeline;

use crate::pipeline::Pipeline;
fn main()  {
    let p = Pipeline {credentials: "my_user".to_string()};
}

pipeline.rs

use crate::auth::mssql; // error here

pub struct Pipeline {
    pub credentials: String,
}

impl Pipeline {
    pub fn get_auth() {
        mssql::authenticate();
    }
}

auth.rs

pub mod mssql;

mssql.rs

pub fn authenticate() {
    println("authenticated");
}

I receive the following error:

 use auth::mssql;
  |     ^^^^ use of undeclared crate or module `auth`

I’ve looked at many examples of similar issues online but cannot wrap my head around why I am getting this error.

If I understand correctly based on the book example here, this should work.

Isn’t use crate::auth::mssql supposed to look in auth.rs and find the included mssql.rs via pub mod mssql?